论文标题
Planck数据中的$ω_bH^2 $的测试一致性
Testing consistency of $Ω_b h^2$ in the Planck data
论文作者
论文摘要
我们发现，来自Pranck的宇宙微波背景温度和极化功率光谱测量限制了参数$ω_bh^2 $主要是通过以下方式：这使我们仅从普朗克数据就可以在$ω_bh^2 $上获得两个不同但相当强的约束。它们是一致的，显示了Planck $ω_bH^2 $约束的稳健性。我们也可以将这些约束重新示为a）汤姆森散射横截面的变化，因为重组小于$ \ sim 2 \％$和b）重组过程中的动量保留了比汤姆森散射更好地比$ \ sim 2 \％$更好。解耦$ω_bh^2 $影响Planck数据的八种方式导致$ H_0 $仅比标准分析中略高，$（68.3 \ pm 1.6）\，\ Mathrm {km/s/s/mpc} $。所有$ω_bh^2 $约束的总体一致性并不暗示标准宇宙学模型的任何问题。
We find that the cosmic microwave background temperature and polarization power spectra measurements from Planck constrain the parameter $Ω_bh^2$ mostly through: A) the amplitude of Thomson scattering and B) a factor that ensures Thomson scattering does not violate momentum conservation of the baryon-photon fluid. This allows us to obtain two distinct but comparably strong constraints on $Ω_b h^2$ from the Planck data alone. They are consistent, showing robustness of the Planck $Ω_b h^2$ constraint. We can alternatively rephrase these constraints as A) the change of the Thomson scattering cross section since recombination is less than $\sim 2\%$ and B) momentum during recombination is conserved to better than $\sim 2\%$ by Thomson scattering. Decoupling the eight various ways in which $Ω_b h^2$ affects the Planck data leads to $H_0$ only slightly higher than in the standard analysis, $(68.3 \pm 1.6)\,\mathrm{km/s/Mpc}$. The overall consistency of all $Ω_b h^2$ constraints does not suggest any problem with the standard cosmological model.
